Draws blood from patients or donors in hospital, blood bank, or similar facility for analysis or other medical purposes. Assembles equipment, such as tourniquet, needles, blood collection devices, gauze, cotton, and alcohol on work tray, according to requirements for specified tests or procedures. Verifies or records identity of patient or donor and converses with patient or donor to allay fear of procedure. Applies tourniquet to arm, locates accessible vein, swabs puncture area with disinfectant, and inserts needle into vein to draw blood into collection tube or bag. Withdraws needle, applies treatment to puncture site, and labels and stores blood container for subsequent processing. May prick finger to draw blood. May conduct interview, take vital signs, and draw and test blood samples to screen donors at blood bank.